Walls and tower problems

Is there any way to turn off the balistas in siege towers? Because when you have a large stone wall, the siege towers that the enemy uses when they attack you are so good at zapping your men with their balistas that large stone walls are actually an advantage to the attacker IMHO. and are they realistic?

I don't think there is a way to turn it off, and the entire walls are fairly ahistoric (excepting the Oppida) and medieval looking.

Those towers seem to have a large contigent of Roman Repeating ballistas, Chinese repeating crossbowmen, and of course, German MG42'S, all shooting at the same time.

MANNED BY CHUCK NORRIS

So there's nothing I can do about it? Is there some cheat to remove large stone walls once iv'e built them, cos I'm not sure you can demolish them.

You can't.

Also, the towers suck. Big time.